I moved states, and changed my service to the new address. They started billing me for
both addresses for several months.
Several calls and many, many hours later, I was finally able to get the double-billing resolved. But they didn't remove the charges that had accrued. Several calls later I was able to get someone who assured me they could deal with the issue. I demanded a $50 statement credit as compensation for my time.
They flipped the sign on the statement credit, and it was an additional $50 charge.
I got called by their collections department. I patiently explained the issue, and they were very sympathetic. Then they asked why don't I just settle up the outstanding balance now and then we can sort out the billing issue later. For the first time in this ordeal I lost my cool and flatly told them to go fuck themselves.
Several calls later it was finally resolved, but this entire experience was astounding. There was nobody qualified to escalate to. I was completely at the mercy of the random humans the system picked for me to interact with, and there were seemingly zero knobs I could turn or buttons to push to summon someone who could actually assist. To their credit, many of the support staff seemed just as frustrated as I was, but were equally hamstrung by the system they were interacting with.